I love the material in here. Your mixing and use of sounds to build the atmosphere really show off your strengths.
The only thing I'd say is that if you're looking to use it as basis for expansion, you may consider revising the existing material to include more "texture" for you to work with (i.e. arpeggiated or pulsed harmonies, rhythmic motifs, etc.). Your harmony and melody are satisfyingly ethereal, especially if it's meant to introduce an album. If you're stuck, fool around with the textures like I said, and see where that takes you. You don't always have to like what you're writing in the moment you're writing it, but don't delete it and sometimes you'll be (pleasantly) surprised when you return to it later.
Hope this helps, and would love to hear the finished product someday!
Gustav Johnson